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Roots contribute more to refractory soil organic matter than above-ground crop residues, as revealed by a long-term field experiment

Kätterer, Thomas and Bolinder, Martin Anders and Andrén, Olof and Kirchmann, Holger and Menichetti, Lorenzo (2011). Roots contribute more to refractory soil organic matter than above-ground crop residues, as revealed by a long-term field experiment. Agriculture, ecosystems & environment. 141 :1-2, 184–192
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Official URL: http://dx.doi.org/10.1016/j.agee.2011.02.029

Abstract

We revisited the well documented and ongoing long-term 'Ultuna continuous soil organic matter field experiment' which started in 1956 at the Swedish University of Agricultural Sciences. The objective of the experiment is to quantify effects of six organic amendments and mineral N fertilizers on the crop and soil. We used the ‘equivalent soil mass’ concept for estimating changes in the topsoil C stocks in all 15 treatments. C inputs from amendments were measured and those from crops were calculated using allometric functions and crop yields. Clustering C inputs into seven categories by quality allowed us to calculate a ‘humification’ coefficient for each category. Here, these coefficients simply were based on the fraction of total C input that still remains in the topsoil after about 50 years. As indicated by previous studies, this coefficient was highest for peat, followed by sewage sludge, manure, sawdust and aboveground crop residues. The most interesting result from the current investigation is that the optimized coefficient for root-derived C was about 2.3 times higher than that for aboveground plant residues. The calculated results were found to be robust in a sensitivity analysis. Our findings strongly support the hypothesis that root-derived C contributes more to relatively stable soil C pools than the same amount of aboveground crop residue-derived C.

Authors/Creators:Kätterer, Thomas and Bolinder, Martin Anders and Andrén, Olof and Kirchmann, Holger and Menichetti, Lorenzo
Title:Roots contribute more to refractory soil organic matter than above-ground crop residues, as revealed by a long-term field experiment
Series/Journal:Agriculture ecosystems & environment (0167-8809)
Year of publishing :2011
Volume:141
Number:1-2
Page range:184–192
Publisher:Elsevier
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Agricultural landscape
ISSN:0167-8809
Language:English
Additional Information:Published in Agriculture Ecosystems and Environment by Elsevier.
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:?? A50 ??
P Natural resources > P30 Soil science and management
P Natural resources > P34 Soil biology
P Natural resources > P35 Soil fertility
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Other Earth and Related Environmental Sciences
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:carbon sequestration, humification coefficient, equivalent soil mass, long-term field experiment, roots
URN:NBN:urn:nbn:se:slu:epsilon-e-81
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-81
Additional ID:
Type of IDID
DOI10.1016/j.agee.2011.02.029
ID Code:8117
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Thomas Kätterer
Deposited On:05 May 2011 11:14
Metadata Last Modified:02 Dec 2014 10:46

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